Skip to main content


Internal Medicine

Language(s) Spoken


Joined Kelsey-Seybold

July 1989

Accepting New Patients?


​​​​​Professional Backgr​​ound

Dr. MacGregor  received his medical degree and completed his residency program in Internal Medicine at The University of Texas Medical Branch at Galveston. He is board certified by the American Board of Internal Medicine. 

Professional Asso​​​ciations

Dr. MacGregor is a member of the American College of Physicians.

Hobbies and Inter​​ests

Dr. MacGregor is a former recipient of the Eagle Scout Award and is married with seven children.

​My goal is to help patients understand their medical problems and treatment options so they can make appropriate health decisions.  I try to do this in a caring atmosphere.

Available Appointments with Mark MacGregor, MD

Visit Type :


​​​​​​​​​​Virtual Health

For the safety and protection of our patients and healthcare provider team, Virtual Visit options are available to all new and current patients.

Learn More​


Use your secure patient portal to book appointments online.
What is MyKelseyOnline?​

Log In

​​​​​​​​​​​​By Phone

Our Contact Center is here to serve you, 24 hours a day, 7 days a week.


Awards & Recognitions

National Committee for Quality Assurance (NCQA)
Dr. MacGregor has been recognized with a presti​gious national certification for excellence in carin​g for diabetic patients, awarded by the National Committee for Quality Assurance (NCQA). Certification through NCQA’s national Diabetes Recognition Program comes after a comprehensive, individualized review process to verify a physician’s adherence to national standards of excellence in caring for patients diagnosed with diabetes.